Assessment of effect of dewatering of excavations on nearby piers of operating high-speed railways
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摘要: 针对苏州虎丘婚纱城基坑降水对临近沪宁城际铁路的影响评估,在达西定律和裘布依假设基础上,提出一种考虑基坑落底式止水帷幕在不同程度失效情况下,基坑降水引起运营高铁桥墩附近地下水位变化的计算思路,并对基坑降水导致的运营高铁桥墩沉降和安全系数变化进行了影响分析,结果表明：在一定假设条件下,基坑降水将导致桥梁桩基中性点和桥墩沉降变形呈非线性增长变化,并降低了桥梁桩基安全系数,高铁桥墩受地下水变化敏感。Abstract: According to the evaluation of effect of dewatering of excavation of Huqiu Wedding Mall in Suzhou on nearby Shanghai-Nanjing Railway, on the basis of the Darcy's law and the Dupuit assumption, some computing ideas on changes of groundwater levels caused by dewatering of excavations near the piers of piers of operating high-speed railways, considering different degrees of failure cases of closed cut-off curtains in excavations. The pier settlement of operating high-speed railway and change of safety factor caused by the dewatering of excavations are analyzed. The results show that, under certain assumptions, the dewatering of excavations will cause the nonlinear in crease of the neutral point of the bridge and pier settlement growth changing. The safety factor of the pile foundation is reduced, and the piers of high-speed rail ways are sensitive to change of groundwater.
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[1] 王连俊, 朱孝天, 张光宗. 济南西客站站房基坑降水对京沪高铁路基沉降影响分析[J]. 工程地质学报, 2012, 20(3): 459-465. (WANG Lian-jun, ZHU Xiao-tian, ZHANG Guang-zong. Analysis of subgrade settlement of Beijing-Shanghai High-speed railway due to dewatering for foundation pit at Ji-nan railway station[J]. Journal of Engineering Geology, 2012, 20(3): 459-465. (in Chinese)) [2] 陈明海. 基坑开挖降水引起的地表沉降分析[D]. 杭州: 浙江大学, 2003. (CHEN Ming-hai. Analysis of settlement of ground surface induced by dewatering in excavation[D]. Hangzhou: Zhejiang University, 2003. (in Chinese)) [3] 张俊霞, 李 莉, 张宝森. 基坑降水的三维渗流计算分析 [J]. 岩土工程界, 2002, 5(5): 50-51. (ZHANG Jun-xia, LI li, ZHANG Bao-sen. 3D calculation and analysis of seepage induced by dewatering in excavation[J].Geotechnical Engineering Field, 2002, 5(5): 50-51. (in Chinese)) [4] 冯晓腊, 李栋广. 落底式止水帷幕条件下基坑涌漏量计算[J]. 水文地质工程地质, 2013(5): 16-21. (FENG Xiao-la, LI Dong-guang. Chung leakage quantity calculation of foundation pit on the condition of the cut-off wall insert into impermeable layer[J]. Hydrogeology & Engineering Geology, 2013(5): 16-21. (in Chinese)) [5] 陈崇希, 林 敏. 地下水动力学[M]. 武汉: 中国地质大学出版社, 1999: 59-65. (CHEN Chong-xi, LIN Min. Groundwater dynamics[M]. Wuhan: Chinese Geology University Publishing House, 1999: 59-65. (in Chinese))
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